221421255444650 has 36 divisors (see below), whose sum is σ = 413923504158342. Its totient is φ = 88123433539680.

The previous prime is 221421255444643. The next prime is 221421255444761. The reversal of 221421255444650 is 56444552124122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 168237009125641 + 53184246319009 = 12970621^2 + 7292753^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221421255444595 and 221421255444604.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 53932997 + ... + 57893096.

Almost surely, 2^{221421255444650} is an apocalyptic number.

221421255444650 is a deficient number, since it is larger than the sum of its proper divisors (192502248713692).

221421255444650 is a wasteful number, since it uses less digits than its factorization.

221421255444650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111826503 (or 111826299 counting only the distinct ones).

The product of its (nonzero) digits is 3072000, while the sum is 47.

The spelling of 221421255444650 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred forty-four thousand, six hundred fifty".